Presidio JS - Client-Side PII Scanner

Presidio JS is a client‑side library that scans text for personally identifiable information (PII) using a named‑entity recognition (NER) model of roughly 67 MB. It can detect a variety of entity types such as personal names, email addresses, social‑security numbers, phone numbers, credit‑card numbers, IP addresses, IBANs, and cryptocurrency wallet identifiers. The scanner runs entirely in the browser, allowing developers to feed input strings and receive a list of detected entities along with confidence scores, without sending data to a server.

The tool is intended for developers who need to anonymize user‑generated prompts or other free‑form text before it is transmitted or stored. By exposing a simple “scan” operation and an “anonymize” fallback, it lets applications replace or mask detected PII while preserving the surrounding content. The interface includes controls for selecting which entity types to target and displays performance metrics such as elapsed time.

Presidio JS is positioned as an experimental utility for privacy‑focused workflows, emphasizing on‑device processing to keep sensitive data under the user’s control. It is suitable for web applications that require quick, client‑side PII detection without relying on external services.